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rain water


the KH (12) & GH (14) of my tap water are to high, I looked at reserve
osmose equipment but this looks like an expensive methode - not to
mention the waste of water (only 1/4 ratio)

what about just using rain water (collected via the roof of the house &
stored in a 7000 l concrete 'barrel')

I live in Europe, Brussels, and am worried about pollution.

rain water :

PH : 7.8
GH : 3
KH : 2   (I would have expected lower)

would it be sufficient to run that rain water trough a activated carbon
filter before use ?  Buying water at the local shop is not an option due
to the size (700l) of my tank.

any help is appreciated.